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嗨,我正在使用PSA E4440A进行互调测量。
设置如下:0标记:标记Fctn Band / IntvlPower RBW:1Hz屏幕上弹出一条消息:RBW:Accy未指定低于-110dBm我应该忽略这个或是否有任何设置我可以做以获取此消息 关闭? BR,Yiliu编辑:wangyiliu于2013年6月16日下午9:56 以上来自于谷歌翻译 以下为原文 Hi, all I am doing intermodulation measurement using the PSA E4440A. Settings are the following span: 0 marker: marker Fctn Band/IntvlPower RBW: 1Hz One message pops out on the screen: RBW:Accy unspecified below -110dBm should I simply ignore this or are there any settings that I could do to get this message off? BR, Yiliu Edited by: wangyiliu on Jun 16, 2013 9:56 PM |
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5个回答
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Hi Yiliu - PSA中的第一代数字中频(Natasha DIF)在扫描时使用1 Hz RBW滤波器时存在限制。
这已经在X系列(PXA,MXA,EXA,CXA)中使用的数字IF的FPGA版本中得到修复。 您可以使用3 Hz RBW。 实际上,如果您的信号高于分析仪的本底噪声,则可以使用更宽的带宽。 频带功率标记可以轻松地与更宽的带宽集成。 如果本底噪声太高,您可以打开前置放大器以降低本底噪声。 这使您可以更快地扫描而不需要将RBW降低到如此窄的设置。 问候 - 以上来自于谷歌翻译 以下为原文 Hi Yiliu - The first generation digital IF in PSA (the Natasha DIF), had a limitation when using the 1 Hz RBW filter when sweeping. This has since been fixed in the FPGA versions of the digital IF used in X-Series (PXA, MXA, EXA, CXA). You can instead use the 3 Hz RBW. Actually, if your signal is higher than the noise floor of the analyzer, you can instead use a wider bandwidth. The band power markers can just as easily integrate with a wider bandwidth. If the noise floor is too high, the you can potentially turn on the preamplifier to lower the noise floor. This allows you to sweep faster instead of needing to reduce the RBW to such a narrow setting. Regards - |
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醉狼工作室 发表于 2019-1-23 16:25 嗨,塔博特,非常感谢你的帮助。 我检查了PSA E4440A,打开了它的前置放大器,然而,我发现以下情况,当跨度很宽,RBW很大时,打开内部前置放大器会使噪音水平恶化。 当跨度很窄(100Hz)时,RBW很小(3Hz),内部前置放大器ON真的可以提高噪声水平。 我有使用PXA N9030A的经验,对于那个型号,打开前置放大器会使噪音水平恶化,即使跨度和RBW很小。 你有什么意见吗? 我在第62页上阅读了应用笔记5952-0292“安捷伦频谱分析基础知识”,对前置放大器的影响有一些解释。 有两种情况,一种是噪声基底上升15dB或更多,另一种几乎没有变化。 非常感谢您的帮助! 你的,Yiliu编辑:wangyiliu于2013年5月30日下午2:56 以上来自于谷歌翻译 以下为原文 Hi, tabbott, thank you very much for your kind help. I checked the PSA E4440A, turned on its pre amp, however, I found the following, when the span is wide, RBW is large, turn on the internal preamp would worsen the noise level. when span is narrow(100Hz), RBW is small (3Hz), internal preamp ON really improves the noise level. I have had experience with the PXA N9030A, for that model, turn on the pre-amplifier would worsen the noise level, even if the span and RBW is small. Do you have any comments? I read about the application note 5952-0292 "Agilent Spectrum Analysis Basics", on page 62, there are some explanations on the effect of the pre amp. There are two cases, one is noise floor goes up by 15dB or more, the other is barely no change. Your help would be highly appreciated! Yours, Yiliu Edited by: wangyiliu on May 30, 2013 2:56 PM |
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dkhwakd 发表于 2019-1-23 16:43 嗨,所有在SA设置中,当查看低电平信号或互调信号时,建议打开前置放大器。 确实,当前置放大器打开时,噪音水平会降低。 我的问题是,如果SA设置是零跨度,那个频率的标记值会改善还是不改变? 非常感谢! 你的,伊柳 以上来自于谷歌翻译 以下为原文 Hi, all in the SA setting, when viewing the low level signal, or intermodulated signals, it is recommended to turn ON the pre-amp. It is true that the noise level will be reduced when pre-amp is turned on. My question is, if the SA setting is zero span, marker value of that frequency would be improved or not change? Thanks a lot! Yours, Yiliu |
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dkhwakd 发表于 2019-1-23 16:50 Hi Yiliu - 在扫描模式下,您只需使用大于1 Hz的RBW。 对于集成电源,无论分辨率带宽设置如何,分析仪都知道如何集成电源。 当扫描时使用1 Hz RBW时,PSA的旧ASIC数字IF(Natasha)在动态范围方面存在限制。 对于X系列信号分析仪中使用的较新的FGPA数字IF,此限制不再是问题。 问候 - 以上来自于谷歌翻译 以下为原文 Hi Yiliu - You can simply use an RBW greater than 1 Hz when in swept mode. For integrated power, the analyzer knows how to integrate power regardless of the resolution bandwidth setting. The PSA’s older ASIC digital IF (Natasha) had a limitation in dynamic range when using the 1 Hz RBW when sweeping. This limitation is no longer an issue for the newer FGPA Digital IF used in X-Series Signal Analyzers. Regards - |
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醉狼工作室 发表于 2019-1-23 16:58 嗨,雅培,非常感谢你的帮助。 从现在开始,我将避免在PSA系列中使用1Hz RBW。 BR,伊柳 以上来自于谷歌翻译 以下为原文 Hi, abbott, thanks a lot for the help. I will avoid using 1Hz RBW in the PSA series from now on. BR, Yiliu |
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